util/msrtool/darwin.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <fcntl.h>
   6 #include <unistd.h>
   7 #include <string.h>
   8 #include <errno.h>
   9
  10 #include "msrtool.h"
  11
  12 /* This Darwin support requires DirectHW, which is available at
  13  * https://www.coreboot.org/DirectHW
  14  */
  15
  16 int darwin_probe(const struct sysdef *system)
  17 {
  18 #ifdef __DARWIN__
  19         return iopl(3) == 0;
  20 #else
  21         return 0;
  22 #endif
  23 }
  24
  25 int darwin_open(uint8_t cpu, enum SysModes mode)
  26 {
  27 #ifdef __DARWIN__
  28         if (cpu > 0) {
  29                 fprintf(stderr, "%s: only core 0 is supported on Mac OS X right now.\n", __func__);
  30                 return 0;
  31         }
  32         return 1;
  33 #else
  34         return 0;
  35 #endif
  36 }
  37
  38 int darwin_close(uint8_t cpu)
  39 {
  40         return 1;
  41 }
  42
  43 int darwin_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val)
  44 {
  45 #ifdef __DARWIN__
  46         msr_t msr;
  47
  48         msr = rdmsr(addr);
  49
  50         val->hi = msr.lo;
  51         val->lo = msr.hi;
  52         return 1;
  53 #else
  54         return 0;
  55 #endif
  56 }